Class: RegularExpression::Compiler::X86::Compiled

Inherits:
Object
  • Object
show all
Defined in:
lib/regular_expression/compiler/x86.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(buffer) ⇒ Compiled

Returns a new instance of Compiled.



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# File 'lib/regular_expression/compiler/x86.rb', line 9

def initialize(buffer)
  @buffer = buffer
end

Instance Attribute Details

#buffer ⇒ Object (readonly)

Returns the value of attribute buffer.



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# File 'lib/regular_expression/compiler/x86.rb', line 7

def buffer
  @buffer
end

Instance Method Details

#disasm ⇒ Object 



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# File 'lib/regular_expression/compiler/x86.rb', line 13

def disasm
  output = StringIO.new

  crabstone = Crabstone::Disassembler.new(Crabstone::ARCH_X86, Crabstone::MODE_64)
  crabstone.disasm(buffer.memory.to_s(buffer.pos), buffer.memory.to_i).each do |insn|
    output.printf(
      "0x%<address>x:\t%<instruction>s\t%<details>s\n",
      address: insn.address,
      instruction: insn.mnemonic,
      details: insn.op_str
    )
  end

  output.string
end

#to_proc ⇒ Object 



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# File 'lib/regular_expression/compiler/x86.rb', line 29

def to_proc
  function = buffer.to_function([Fiddle::TYPE_VOIDP, Fiddle::TYPE_SIZE_T], Fiddle::TYPE_SIZE_T)

  lambda do |string|
    value = function.call(string, string.length)
    value if value != string.length + 1
  end
end